Mastervolt whisper 16 ultra User Manual page 30

TROUBLE SHOOTING
PROBLEM
Generator output voltage too
low when no load is on it (less
than 225V between phase and
neutral).
Generator output voltage too
low under load (less than 225V
between phase and neutral).
In no load condition it is OK
Generator output voltage too
high without load, (more than
235V between phase and
neutral)
Generator output voltage too
high with load, (more than 235V
between phase and neutral)
In no load condition it is OK
Generator voltage fluctuates.
Generator is not able to start an
electric motor
30
CAUSE
• Engine is not reaching the rated RPM.
• Faulty AVR. When slightly too low,
adjustment could be necessary
• Defective diode(s)
• Unbalanced load; check the voltage of
the other phases. When the voltages
are different this is caused by an
unbalanced load.
• Engine is not reaching the rated RPM.
Possibly too much load or engine
problems (lack of fuel)
• Faulty AVR or readjustment necessary
• Over-energising due to defective AVR
or wrong AVR setting
• Unbalanced load
• Disturbances on the electrical system/
user side.
• AVR reacts on fluctuating load
• Engine runs irregularly.
If the generator is unable to supply
enough power to start an AC electric
motor, this is usually because this motor
draws too much current during starting
Copyright © 2008 Mastervolt / November 2008 / WHISPER 16 ULTRA Three phase / EN
SOLUTION
Refer to special procedures to readjust RPM.
Try to readjust AVR. Check by independent
excitation if the problem is in the AVR or in the
windings and replace AVR if necessary (see
special procedures).
Check the diodes in the rotor and replace
(refer to special procedures).
Bring load in balance. When slightly out of
balance, remove the sense wires to the phase
with the highest load and check if the voltage
on the other phases is not too high.
Switch off a load; (part off) consumers
See to engine RPM problems
Try to readjust the voltage
Check by independent excitation if the problem
is in the AVR or in the windings and replace
AVR if necessary (see special procedures).
Check AVR, readjust and replace AVR if
necessary (see special procedures)..
Bring load in balance.
When slightly out of balance, remove the
sense wires to the phase with the highest load
and check if the voltage on the other phases is
not too low.
Check if electrical load is fluctuating
Do not apply strong fluctuating loads
When engine runs irregularly see section:
"Engine runs irregularly" at the "Engine faults"
paragraph.
Check the electric motor's current draw
required for starting. This should not exceed
the rated generator peak output current. This
could be remedied by using a "soft-start".
Inquire at your nearest Mastervolt dealer or
directly at the manufacturer, Mastervolt in the
Netherlands.